Process of drying japanese lacquer



Patented Sept, l9, 1922..

UNETEE STATEd FATENT OFFEQE.

YUJ'I SHIBATA, OF TOKYO IEU, AND Y'USHICHI NISI-IIZAWA, 0F TOKYO, JAPAN.

PROCESS OF DRYINGJAPANESE LACQUER.

N0 Drawing.

To aZZ whom it may concern:

Be it known that we, YUJI SHIBATA and YUsHIOI-II NISHIZAWA, subjects ofJapan, and residing, respectively, at No. 317 Hiyakunincho, Okubo Machi,Toyotama Gun, Tokyo Fu, and at No. 110 Hakusan Goten Machi, KoishikawaKu, Tokyo, Japan, have invented new and useful Improvements in a Processof Drying Japanese Lacquer, of which the following is a specification.

This invention relates to a process for drying Japanese lacquer, andconsists in the addition to the lacquer preparation, of complex salts ofcertain metals. The object of this invention is to quicken the dryingand hardening of lacquer coating and at the same time to prevent itssurface from getting wrinkled.

Lacquer has been for a long time a special product of the Orient and asa varnish has many merits unrivalled by any other known substance. ithas however some drawbacks and is sometimes liable to collectirregularly, which impairs its appearance. Besides, a special equipmentis necessary to accelerate its drying by supplying thereto sulficientheat and moisture. Thus, it is very difficult to apply this substance toany large surface such as a building or any article of considerabledimensions.

Now, while carrying on researches with regard to complex salts ofcertain metals, we have discovered a process by which the abovedrawbacks can be removed.

Our process consists in mixing one or more complex salts of copper andzinc, such as copper ammonic sulphate and zinc-amnionic sulphate, andcomplex salts cobalt, nickel, manganese, magnesium, calcium, tin andaluminium with a lacquer preparation in the proportion of from 5 to 10per cent, and the result is that the coating made with the mixture driesso rapidly that what would take twenty-four'hours to dry if treatedaccording to a process hitherto known, will be effected in a few hours;and if the proportion of the complex salts of metals be increased to 20or 30 per cent, the mixture will become plastic, and perfectly dry in anhour or two. This great rapidity with Application filed March 29, 1920.Serial No. 369,792. I

which lacquer coating can be made dry, en ables us to apply thesubstance to buildings,

carriages, and any other large surface; and c in this respect thisinvention considerably reason why wrinkles are not produced is becausethere is no difference in viscosity according to our invention causedbetween the outer surface exposed to the air and inner part owing tooXydation, or drying, taking place more actively in the former than inthe latter. Moreover, when a larger proportion. of the complex salts ofmetals is added to lacquer preparation, not only does it quicken thehardening thereof, but gives thereto a certain degree of consistency.Further, our invention gives to lacquer greater viscosity, luster andcovering power.

We claim:

1. A process of drying Japanese lacquer characterized by the admixturetherewith of complex salt of a metal and ammonium, substantially as andfor the purposes hereinbefore set forth.

2. A process of drying Japanese lacquer characterized by the admixturetherewith of complex salts of copper ammonic sulphate, substantially asand for the purposes hereinbefore set forth.

8. An article of manufacture, comprising a Japanese lacquer preparationhaving therein a complex salt of metals and ammonium in the proportionof five to thirty per cent.

In testimony whereof we have signed our names to this specification.

YUJI SHIBATA. YUSHIC-HI NISHIZAVVA.

